Passing data backwards by clicking a UITableView cell - iOS/Swift - ios

Question

My application has 3 UIViewControllers. ViewController #1-->#2 is by "show segue" and from #2-->#3 is by "present modally". #3 has a UITableView. When a cell is clicked, I would like to jump back to #1 and pass data from #3 as well.
I managed to dismiss #3 and go back to #2 by using this function, but this is not what I need. Please advise.
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
self.dismiss(animated: true, completion: {
self.funcToCall(id: id)
}

Answer 1

you have to use delegate to pass the value to vc#1 and pop to root view controller.

Answer 2

You should be able to achieve the desired result by defining another segue that triggers on tapping the UITableViewCell. Make sure to assign it an identifier. Add the code below to the UITableView controller
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "Segue Identifier Here" {
var dest = segue.destinationViewController as! DestViewController
dest.dataObj = dataToBePassed
}

Answer 3

Try pass data through NSNotificationCenter
Register to receive notification in VC1's ViewDidLoad
NotificationCenter.default.addObserver(self, selector: #selector(self.myData(_:)), name: NSNotification.Name(rawValue: "notificationName"), object: nil)
// handle notification
func myData(_ notification: NSNotification) {
let object = notification.object // You data
}
Post this notification in VC3
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "notificationName"), object: nil, userInfo: **yourData**)
// Do popToRootViewContoller

Answer 4

You can use closures, here is an example:
ViewController3
class ViewController3: UIViewController {
var cellSelectedHandler: ((String)->Void)?
.
.
.
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
if cellSelectedHandler != nil {
cellSelectedHandler!("data you want to pass")
}
}
ViewController2
class ViewController2: UIViewController {
//add vc3 as instance variable
let vc3 = ViewController3()
ViewController1
class ViewController: UIViewController {
func presentViewController2() {
let vc2 = ViewController2()
vc2.vc3.cellSelectedHandler = {(dataPassed) in
vc2.vc3.dismiss(animated: true, completion: nil)
_ = vc2.navigationController?.popViewController(animated: true)
//use dataPassed
}
}